A prenuptial agreement is only valid if it is completed prior to marriage. After a couple is married, they may draw up a post-nuptial agreement. In the United States, prenuptial agreements are recognized in all fifty states and the District of Columbia.
Osmosis - the diffusion of water (across a membrane) Water will move in the direction where there is a high concentration of solute (and hence a lower concentration of water. A simple rule to remember is: Salt is a solute, when it is concentrated inside or outside the cell, it will draw the water in its direction.
Osmos means thrusting or pushing, and the scientific process of osmosis happens when fluid in a super-concentrated area thrusts through little holes in the cell's wall and heads for a less concentrated place. The fluid might go back and forth a few times until both solutions are equally concentrated.